<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="iscollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#545c64" text-color="#fff"
                  active-text-color="#409eff" :unique-opened="true"
                  :collapse="iscollapse" :collapse-transition="false"
                  :router="true" :default-active="activePath">
          <!-- 一级菜单 -->
          <!-- 因为这个index只接收字符串，所以要用到字符串拼接：+'' -->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children"
                          :key="subItem.id" @click="saveNavState('/'+subItem.path)">
              <template slot="title">
              <!-- 二级导航的图标 -->
              <i class="el-icon-menu"></i>
              <!-- 二级导航的文本 -->
              <span>{{subItem.authName}}</span>
            </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
  export default {
    name: "Home",
    data(){
      return {
        //左侧菜单数据
        menuList: [],
        iconObj: {
          '125': 'iconfont icon-user',
          '103': 'iconfont icon-tijikongjian',
          '101': 'iconfont icon-shangpin',
          '102': 'iconfont icon-danju',
          '145': 'iconfont icon-baobiao',
        },
        iscollapse: false, //默认为不折叠
        activePath: '', //被激活的链接地址
      }
    },
    created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
      logout(){
        window.sessionStorage.clear() //清空sessionStorage里的内容
        this.$router.push('/login') //跳转回login登录页面
      },
      async getMenuList(){
        const {data: res} = await this.$http.get('menus')
        if(res.meta.status != 200) {
          return this.$messsge.error(res.meta.msg)
        }
        this.menuList = res.data
        // console.log(res);
      },
      //点击按钮切换菜单的折叠和展开
      toggleCollapse(){
        this.iscollapse = !this.iscollapse
      },
      //保存链接的激活状态
      saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath = activePath
      }
    }
  }
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }
  .el-header {
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #373D41;
    .el-menu {
      border-right: none;
    }
  }
  .el-main {
    background-color: #eaedf1;
  }
  
  .iconfont {
    margin-right: 10px;
  }

  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer; /*sub放上去变成小手*/
  }
</style>